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irina [24]
3 years ago
8

What is a polymer? Give an example.

Biology
1 answer:
Luden [163]3 years ago
7 0

Answer:

A polymer is a substance that has a molecular structure consisting chiefly or entirely of a large number of similar units bonded together

Synthetic Polymers:  nylon, polyethylene, polyester, Teflon, and epoxy.

Natural Polymers: silk, wool, DNA, cellulose and proteins

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Match the following organs and organ systems. 1.digestive system brain 2.central nervous system tracheal system 3.respiratory sy
Amiraneli [1.4K]

The correct macthing of the organs with their organ systems is as follows.

1. Digestive system - intestines.

2. Central nervous system - brain.

3. Respiratory system - tracheal system.

4. Excretory system - bladder.

Digestive system is made up of the alimentary canal consisting of the digestive organs and the glands. Among the digestive organs, the intestines play a major role in the process of digestion. The small intestine is the site of complete digestion which is associated with the pancreas and liver. The large intestine is involved the absorption of water from the digested food and remaining waste material is stored and thrown out of the body during defecation.

The central nervous system is made up of the brain and the spinal cord. The brain makes the largest part and the functional of the central nervous system. It controls most of the activities of the body. It is made up of three parts called the cerebrum, cerebellum and medualla oblongata and is protected by the skull.

The respiratory system is divided into the upper respiratory tract consisting of the nasal cavity, pharynx and larynx, and the lower respiratory tract consisting of the trachea, bronchi, bronchioles and the alveoli. The trachea or the wind pipe is a cylindrical tube infront of the oesophagus, supported by 16-20 C-shaped hyaline cartilage. It serves as a passage for air to move in and out of the lungs.

The excretory system is made up of a pair of kidneys, a pair of ureters, an urinary bladder and an urethra. The urine produced by the kidney flows through the ureters and is collected in the urinary bladder. A spinchter (a ring of muscle) guards the opening of the bladder into the urethra and relaxes only at the time of urination under the impulse from the brain.

6 0
3 years ago
I am doing a project on Down Syndrome and my teacher told us that we have to include information on the mode. What is the mode?
rewona [7]
You should ask your teacher to be sure, but I think that you teacher meant like the  mode of transmission.... Like genetically inherited and such.
5 0
3 years ago
Compare and contrast the evidence that supports the two hypotheses describing how long, complex molecules that carry information
Rudiy27

Oparin and Haldane's theory and Miller's experiment are the proof that long complex molecules that carry information such as DNA, might have formed on early earth.

Explanation:

Oparin and Haldane Hypothesis states that life on Early earth could have evolved by chemical evolution.

Oparin and Haldane said that the reducing atmosphere of the early earth caused simple inorganic molecules to react by using sunlight and formed molecules like amino acids and nucleotides.

These monomers combined to form polymers, they would have attained self-replicating tendency eventually these would have assembled into structures and these macromolecules had also made membrane-bound organelle.

Although this hypothesis is not fully accepted but part of it which talks about formation of molecules is accepted.

Millers and Urey in their experiment created an artificial reducing environment like that of early earth. They used a heated pool of water, atmospheric gases like H2O,CH4,N2, NH4 and sparks of electricity. After running the experiment for some days they found that amino acids, sugars, lipids and other organic molecules had formed.

Their hypothesis is not fully accepted but part of is evident that organic building block is formed from inorganic constituent on the earth.

8 0
3 years ago
Who was responsible for medical records before 1928?
tia_tia [17]

Answer:

The physical medical record belongs to the physician who created and the facility in which the record was created. The information gathered within the original medical record is owned by the patient. That is why patients are allowed a COPY of their medical record, but not the original document.

Hope it helps you.

8 0
3 years ago
Water regulates the earth's temperature? true or false
taurus [48]
True...............!!!!!!!!!!
Hope it's help you
4 0
3 years ago
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